jm2l/jm2l/models.py

# -*- coding: utf8 -*-
import datetime
import sqlalchemy as sa
import hashlib
from pyramid.security import unauthenticated_userid
from sqlalchemy.orm import relationship, backref
from sqlalchemy import func
from sqlalchemy import or_
from sqlalchemy import (
    Column,
    Integer,
    Text,
    Unicode,
    UnicodeText,
    DateTime,
    Enum,
    Boolean,
    ForeignKey
    )

from slugify import slugify
from webhelpers.text import urlify
from webhelpers.paginate import PageURL_WebOb, Page
from webhelpers.date import time_ago_in_words
from collections import namedtuple


from sqlalchemy.ext.declarative import declarative_base

from sqlalchemy.orm import (
    scoped_session,
    sessionmaker,
    relation
    )

from zope.sqlalchemy import ZopeTransactionExtension

DBSession = scoped_session(sessionmaker(extension=ZopeTransactionExtension()))
Base = declarative_base()

CurrentYear = 2015

class TasksArea(Base):
    __tablename__ = 'staff_tasks_area'
    uid           = Column(Integer, primary_key=True)
    name          = Column(Unicode(80))
    description   = Column(UnicodeText)

    @classmethod
    def by_id(cls, id):
        return DBSession.query(cls).filter(cls.uid == id).first()

class Tasks(Base):
    __tablename__ = 'staff_tasks'
    uid           = Column(Integer, primary_key=True)
    area_uid      = Column(Integer, ForeignKey('staff_tasks_area.uid') )
    due_date      = Column(DateTime, default=None)
    closed_by     = Column(Integer, ForeignKey('users.uid') )
    closed_date   = Column(DateTime, default=None)
    closed        = Column(Integer, default=0)
    name          = Column(Unicode(80))
    description   = Column(UnicodeText)
    area          = relationship(TasksArea, backref=backref("tasks") )

    @classmethod
    def by_id(cls, id):
        return DBSession.query(cls).filter(cls.uid == id).first()

class User_Event(Base):
    """ Créer le lien entre la personne et l' évenement en fonction de l'année"""
    __tablename__ = 'user_event_link'
    uid = Column(Integer, primary_key=True)
    event_uid = Column(Integer, ForeignKey('events.uid') )
    #, primary_key=True)
    #
    user_uid  = Column(Integer, ForeignKey('users.uid') )
    #, primary_key=True)    
    #
    year_uid  = Column(Integer, ForeignKey('jm2l_year.year_uid'), default=CurrentYear)
    role     = Column(Unicode(80))
    # Define some relation
    #user     = relationship('User', backref=backref("events_assoc") ) 
    #event    = relationship('events', backref=backref("users_assoc") ) 

class JM2L_Year(Base):
    __tablename__ = 'jm2l_year'
    year_uid      = Column(Integer, primary_key=True)
    description   = Column(UnicodeText)
    doss_presse   = Column(UnicodeText)
    state         = Column(Enum('Archived', 'Cancelled', 'Ongoing'))
    start_time    = Column(DateTime, default=datetime.datetime.now)
    end_time      = Column(DateTime, default=datetime.datetime.now)    
    created       = Column(DateTime, default=datetime.datetime.now)
    last_change   = Column(DateTime, default=datetime.datetime.now)
    
    @property
    def AvailableTimeSlots(self, TimeStep=30):
        Available = self.end_time - self.start_time
        NbMinutes = Available.total_seconds()/60
        NbSteps = NbMinutes/TimeStep
        # Create the range of date each 30min
        date_list = [self.start_time + datetime.timedelta(minutes=TimeStep*x) for x in range(0, int(NbSteps))]
        # Remove out of range datetime
        # Remove hours > 19h
        date_list = filter(lambda x:x.hour < 19, date_list)
        # Remove hours < 10h
        date_list = filter(lambda x:x.hour >= 10, date_list)
        # Remove 12h < hours < 13h
        date_list = filter(lambda x: x.hour<12 or x.hour>=13, date_list)
        return date_list

class User(Base):
    __tablename__ = 'users'
    uid         = Column(Integer, primary_key=True)
    user_id     = Column(Integer)
    nom         = Column(Unicode(80))
    prenom      = Column(Unicode(80))
    pseudo      = Column(Unicode(80))
    slug        = Column(Unicode(164))    
    mail        = Column(Unicode(100))
    password    = Column(Unicode(100), nullable=False)    
    fonction    = Column(Unicode(80))
    website     = Column(Unicode(100))
    phone       = Column(Unicode(10))
    created     = Column(DateTime, default=datetime.datetime.now)        
    last_logged = Column(DateTime, default=datetime.datetime.now)
    last_change = Column(DateTime, default=datetime.datetime.now)
    active      = Column(Integer, default=1)    
    bio         = Column(UnicodeText)    
    gpg_key     = Column(UnicodeText)    
    soc_link    = Column(UnicodeText)
    Staff       = Column(Integer, default=0)
    # relations    
    tiers       = relationship('Tiers', secondary='user_tiers_link' )
    events      = relationship('Event', secondary='user_event_link' )
    tiersship   = relationship('User_Tiers', backref="matching_users") 

    @classmethod
    def by_id(cls, id):
        return DBSession.query(cls).filter(cls.uid == id).first()

    @classmethod
    def by_slug(cls, slug):
        return DBSession.query(cls).filter(cls.slug == slug).first()

    @classmethod
    def by_user_id(cls, user_id):
        return DBSession.query(cls).filter(cls.user_id == user_id).first()
            
    @classmethod
    def by_name(cls, name):
        return DBSession.query(cls).filter(cls.nom == name).first()

    @classmethod
    def by_hash(cls, tsthash):
        for u in DBSession.query(cls):
            if u.my_hash==tsthash:
                return  u
        return None

    @property
    def my_hash(self):
        m = hashlib.sha1()
        m.update("Nobody inspects ")
        if self.nom:
            m.update(unicode.encode(self.nom,'utf8'))
        if self.pseudo:
            m.update(unicode.encode(self.pseudo,'utf8'))
        if self.prenom:            
            m.update(unicode.encode(self.prenom,'utf8'))
        m.update(" the spammish repetition")
        return m.hexdigest()
            
    @property
    def Photos(self):
        return DBSession.query(Media.filename) \
            .filter(Media.media_table=='users') \
            .filter(Media.media_type=='Image') \
            .filter(Media.link_id == self.user_id).all()

    @property
    def PhotosLinks(self):
        from .upload import MediaPath
        return MediaPath().get_list('users', self.uid)

    @property
    def PhotosThumb(self):
        from .upload import MediaPath
        return MediaPath().get_thumb('users', self.uid)
    
    def verify_password(self, password):
        return self.password == password

class TiersOpt(Base):
    __tablename__ = 'tiers_opt'
    uid          = Column(Integer, primary_key=True)
    entity_type    = Column(Unicode(80), nullable=False)
    entity_subtype = Column(Unicode(80))
    entity_role    = Column(Unicode(80))

    @property
    def slug_entity_type(self):
        return slugify(self.entity_type)
        
    @property
    def slug_entity_subtype(self):
        return slugify(self.entity_subtype)        
        
    @classmethod
    def get_entity_type(cls):
        return DBSession.query(cls, func.count(Tiers.ent_type).label('count'))\
            .outerjoin(Tiers)\
            .group_by(cls.entity_type).all()
        
    @classmethod
    def get_entity_sub_type(cls, entity_type):
        return DBSession.query(cls, func.count(Tiers.ent_type).label('count'))\
            .outerjoin(Tiers)\
            .filter(cls.entity_type == entity_type)\
            .group_by(cls.entity_subtype).all()
            
    @classmethod
    def by_id(cls, id):
        return DBSession.query(cls).filter(cls.uid == id).first()            
    
class Tiers(Base):
    __tablename__ = 'tiers'
    uid          = Column(Integer, primary_key=True)
    tiers_id     = Column(Integer)
    name         = Column(Unicode(100), nullable=False)
    slug         = Column(Unicode(100))
    description  = Column(UnicodeText)
    website      = Column(Unicode(100))
    tiers_type   = Column(Integer, ForeignKey('tiers_opt.uid'), default=1)
    created      = Column(DateTime, default=datetime.datetime.now)    
    last_change  = Column(DateTime, default=datetime.datetime.now)
    # relations
    ent_type     = relationship('TiersOpt')     
    #members      = relationship('User', secondary='user_tiers_link' )
    members     = relationship(User, 
                        secondary='user_tiers_link',
                        backref=backref('associate', uselist=False),
                        lazy='dynamic')
    creator_id   = Column(Integer)
    membership   = relationship('User_Tiers', backref="matching_tiers")                        
    roles        = relationship('Role_Tiers', backref="roles_tiers") #secondary='role_tiers_link' )
    
    @classmethod
    def by_id(cls, id):
        return DBSession.query(cls).filter(cls.uid == id).first()
        
    @classmethod
    def by_slug(cls, slug):
        return DBSession.query(cls).filter(cls.slug == slug).first()

    @property
    def get_entity_type(self):
        return DBSession.query(TiersOpt)\
            .filter(TiersOpt.uid == self.tiers_type).first()

    @property
    def logo(self):
        return DBSession.query(Media) \
            .filter(Media.media_table == 'tiers') \
            .filter(Media.media_type == 'Image') \
            .filter(Media.link_id == self.uid)
            
    @property
    def PhotosLinks(self):
        from .upload import MediaPath
        return MediaPath().get_list('tiers', self.uid)

    @property
    def ThumbLinks(self):
        from .upload import MediaPath
        return MediaPath().get_thumb('tiers', self.uid)        

class Role_Tiers(Base):
    """ Créer le lien entre le tiers et son rôle dans l'évenement en fonction de l'année"""
    __tablename__ = 'role_tiers_link'
    uid_role   = Column(Integer, primary_key=True)
    year_uid   = Column(Integer, ForeignKey('jm2l_year.year_uid'), default=CurrentYear)
    tiers_uid  = Column(Integer, ForeignKey('tiers.uid'))
    tiers      = relationship(Tiers, backref=backref("roles_assoc") )
    tiers_role = Column(Enum('Exposant', 'Sponsor', 'Donateur'))

class User_Tiers(Base):
    """ Créer le lien entre la personne et le tiers en fonction de l'année"""
    __tablename__ = 'user_tiers_link'
    uid_tiers = Column(Integer, primary_key=True)
    year_uid  = Column(Integer, ForeignKey('jm2l_year.year_uid'), default=CurrentYear)    
    tiers_uid = Column(Integer, ForeignKey('tiers.uid'))
    tiers     = relationship(Tiers, backref=backref("users_assoc") ) 
    user_uid  = Column(Integer, ForeignKey('users.uid'))    
    user      = relationship(User, backref=backref("tiers_assoc") ) 
    role      = Column(Unicode(80))

class Media(Base):
    __tablename__ = 'medias'
    media_id     = Column(Integer, primary_key=True)
    for_year     = Column(Integer, ForeignKey('jm2l_year.year_uid'))    
    media_table  = Column(Enum('users', 'tiers', 'place', 'salle', 'RIB', 'Justif', 'event' ))        
    media_type   = Column(Enum('Image', 'Video', 'Pres', 'Document'))
    link_id      = Column(Integer)
    mime_type    = Column(Unicode(20))
    size         = Column(Integer)
    width        = Column(Integer)
    height       = Column(Integer)
    length       = Column(Integer)
    filename     = Column(UnicodeText)
    created       = Column(DateTime, default=datetime.datetime.now)
    
    @property
    def get_path(self):
        return '/upload/%s/%s/%s' % (self.media_type, self.media_table, self.filename)

class SallePhy(Base):
    """ Représente une salle dans les locaux """
    __tablename__ = 'phy_salle'
    uid           = Column(Integer, primary_key=True)    
    name          = Column(Unicode(40)) # Numéro de salle vu de polytech
    slug          = Column(Unicode(40))    
    description   = Column(UnicodeText) # Description du matériel disponible
    nb_places     = Column(Integer, default=0) # Nombre de places assises
    
    @classmethod
    def by_id(cls, uid):
        return DBSession.query(cls).filter(cls.uid == uid).first()    
    
class Salles(Base):
    __tablename__ = 'salle'
    salle_id      = Column(Integer, primary_key=True)
    phy_salle_id  = Column(Integer, ForeignKey('phy_salle.uid'))
    year_uid      = Column(Integer, ForeignKey('jm2l_year.year_uid'), default=CurrentYear)    
    name          = Column(Unicode(40))
    place_type    = Column(Enum('Conference', 'Stand', 'Ateliers', 'Autres'))
    description   = Column(UnicodeText) # Description du matériel disponible    
    created       = Column(DateTime, default=datetime.datetime.now)    
    last_change   = Column(DateTime, default=datetime.datetime.now)

    @classmethod
    def by_id(cls, uid):
        return DBSession.query(cls).filter(cls.salle_id == uid).first()

class Place(Base):
    __tablename__ = 'place'
    place_id      = Column(Integer, primary_key=True)
    usage         = Column(Boolean, default=False) # By Default / Extended
    place_type    = Column(Enum('Aeroport', 'Gare', 'JM2L', \
                                'Hotel', 'Habitant', 'Restaurant', 'Autres'))
    display_name  = Column(Unicode(20))
    name          = Column(Unicode(80))
    slug          = Column(Unicode(80))
    specific      = Column(Unicode(80)) # eg Terminal 2
    gps_coord     = Column(Unicode(30))
    adresse       = Column(Unicode(100))
    codePostal    = Column(Unicode(5))
    ville         = Column(Unicode(40))
    website       = Column(Unicode(100))
    description   = Column(UnicodeText)    
    created_by    = Column(Integer, ForeignKey('users.user_id'))
    created       = Column(DateTime, default=datetime.datetime.now)    
    last_change   = Column(DateTime, default=datetime.datetime.now)

    @classmethod
    def by_id(cls, uid):
        return DBSession.query(cls).filter(cls.place_id == uid).first()
        
    @classmethod
    def get_list(cls, All=False):
        if All:
            return DBSession.query(cls).all()
        else:
            return DBSession.query(cls).filter(cls.usage==True).all()

class Itineraire(Base):
    __tablename__ = 'itineraire'
    itin_id       = Column(Integer, primary_key=True)    
    start_place   = Column(Integer, ForeignKey('place.place_id')) # Place link
    arrival_place = Column(Integer, ForeignKey('place.place_id')) # Place link
    distance      = Column(Integer)
    duration      = Column(Integer)
    price         = Column(Integer)
    tr_pied       = Column(Boolean, default=False)
    tr_velo       = Column(Boolean, default=False)
    tr_moto       = Column(Boolean, default=False)     
    tr_voiture    = Column(Boolean, default=False)
    tr_bus        = Column(Boolean, default=False)
    tr_taxi       = Column(Boolean, default=False)
    tr_avion      = Column(Boolean, default=False) 
    description   = Column(UnicodeText)
    created_by    = Column(Integer, ForeignKey('users.user_id')) # User link   
    created       = Column(DateTime, default=datetime.datetime.now)
    last_change   = Column(DateTime, default=datetime.datetime.now)
    # relations
    start         = relationship(Place, foreign_keys=[start_place])
    arrival       = relationship(Place, foreign_keys=[arrival_place])    

class Exchange_Cat(Base):
    __tablename__ = 'exchange_category'
    cat_id        = Column(Integer, primary_key=True)
    exch_type     = Column(Enum('H', 'C', 'M')) # Heberg, Co-voit, Materiel
    exch_subtype  = Column(Unicode(80))
    description   = Column(UnicodeText)

class Exchange(Base):
    __tablename__ = 'exchanges'
    exch_id       = Column(Integer, primary_key=True)
    for_year      = Column(Integer, ForeignKey('jm2l_year.year_uid')) # link JM2L_Year
    exch_done     = Column(Boolean, default=False)
    exch_state    = Column(Enum('Ask', 'Proposal'))
    exch_type     = Column(Enum('H', 'C', 'M')) # Heberg, Co-Voit, Materiel
    exch_categ    = Column(Integer, ForeignKey('exchange_category.cat_id')) # Exchange_Cat link
    # Users
    asker_id      = Column(Integer, ForeignKey('users.uid')) # User link
    provider_id   = Column(Integer, ForeignKey('users.uid')) # User link
    start_time    = Column(DateTime, default=datetime.datetime.now)
    end_time      = Column(DateTime, default=datetime.datetime.now)
    # Co-voiturage
    itin_id       = Column(Integer, ForeignKey('itineraire.itin_id')) # Itineraire link
    # Hebergement
    place_id      = Column(Integer, ForeignKey('place.place_id')) # Place link
    # Materiel
    duration      = Column(Integer)
    description   = Column(UnicodeText)
    pictures      = Column(Unicode(80))
    created_by    = Column(Integer) # User link
    created       = Column(DateTime, default=datetime.datetime.now)
    last_change   = Column(DateTime, default=datetime.datetime.now)
    # relations
    Category      = relationship(Exchange_Cat, backref="exchanges")
    Itin          = relationship(Itineraire, backref="exchanged")
    asker         = relationship(User, foreign_keys=[asker_id], backref="asked")
    provider      = relationship(User, foreign_keys=[provider_id], backref="provided")
    
    @classmethod
    def by_id(cls, id):
        return DBSession.query(cls).filter(cls.exch_id == id).first()    

    @classmethod
    def get_counters(cls):
        return DBSession.query(cls.exch_state, cls.exch_type, cls.exch_done, func.count(cls.exch_id))\
            .filter(cls.for_year==2015)\
            .group_by(cls.exch_state, cls.exch_type, cls.exch_done)

    @classmethod
    def get_my_counters(cls, uid):
        return DBSession.query(cls.exch_state, cls.exch_type, cls.exch_done, func.count(cls.exch_id))\
            .filter(cls.for_year==2015)\
            .filter( or_(cls.asker_id==uid, cls.provider_id==uid) )\
            .group_by(cls.exch_state, cls.exch_type, cls.exch_done)            
    
    @classmethod
    def get_overview(cls, uid):
        # Build a Dic with all exchange to save database access
        DicResult= {}
        for extype in ['F','C','H','M']:
            DicResult[extype] = {}
            for exstate in ['Ask','Proposal','Missing','Agree']:
                DicResult[extype][exstate]=[]
            DicResult[extype]['Counters']={'AllAsk':0, 'AllProp':0, 'AllAgree':0}
        Query = DBSession.query(cls)\
            .filter(cls.for_year==2015)\
            .order_by(cls.start_time).all()
        for item in Query:
            if item.exch_done:
                DicResult[item.exch_type]['Counters']['AllAgree']+=1
            if item.exch_state=='Ask':
                DicResult[item.exch_type]['Counters']['AllAsk']+=1
            if item.exch_state=='Proposal':
                DicResult[item.exch_type]['Counters']['AllProp']+=1
            if item.asker_id==uid or item.provider_id==uid:
                if item.asker_id==uid and item.exch_state=='Ask':
                    DicResult[item.exch_type]['Ask'].append(item)
                if item.provider_id==uid and item.exch_state=='Ask':
                    DicResult[item.exch_type]['Proposal'].append(item)
                if item.asker_id==uid and item.exch_state=='Proposal':
                    DicResult[item.exch_type]['Ask'].append(item)
                if item.provider_id==uid and item.exch_state=='Proposal':
                    DicResult[item.exch_type]['Proposal'].append(item)
                if item.exch_done:
                    DicResult[item.exch_type]['Agree'].append(item)
            else:
                DicResult[item.exch_type]['Missing'].append(item)                   
            
        return DicResult
    
    @classmethod
    def get_pub_list(cls, exch_type):
        return DBSession.query(cls).filter(cls.for_year==2015 and exch_state in ['Ask','Proposal'])\
            .filter(cls.exch_type=='%s' % exch_type)\
            .filter(cls.exch_done==False)\
            .all()
        
    @classmethod
    def get_my_list(cls, uid, exch_type):
        DicResult = {}
        DicResult['Ask']=DBSession.query(cls)\
            .filter(cls.for_year==2015)\
            .filter( or_(cls.asker_id==uid, cls.provider_id==uid) )\
            .filter(cls.exch_type=='%s' % exch_type)\
            .filter(cls.exch_state=='Ask')\
            .order_by(cls.start_time).all()
        DicResult['Proposal']=DBSession.query(cls)\
            .filter(cls.for_year==2015)\
            .filter( or_(cls.asker_id==uid, cls.provider_id==uid) )\
            .filter(cls.exch_type=='%s' % exch_type)\
            .filter(cls.exch_state=='Proposal')\
            .order_by(cls.start_time).all()
        return DicResult
            
class Sejour(Base):
    __tablename__ = 'sejour'
    sej_id        = Column(Integer, primary_key=True)
    user_id       = Column(Integer,  ForeignKey('users.user_id')) # User link
    for_year      = Column(Integer,  ForeignKey('jm2l_year.year_uid')) # link JM2L_Year
    arrival_time  = Column(DateTime)
    arrival_place = Column(Integer,  ForeignKey('place.place_id')) # Place link
    depart_time   = Column(DateTime)
    depart_place  = Column(Integer,  ForeignKey('place.place_id')) # Place link
    created       = Column(DateTime, default=datetime.datetime.now)
    last_change   = Column(DateTime, default=datetime.datetime.now)    

class Event(Base):
    __tablename__ = 'events'
    uid           = Column(Integer, primary_key=True)
    salle_uid     = Column(Integer,  ForeignKey('salle.salle_id'))    
    event_uid     = Column(Integer)
    for_year      = Column(Integer,  ForeignKey('jm2l_year.year_uid')) # link JM2L_Year
    name          = Column(Unicode(100), nullable=False)
    slug          = Column(Unicode(100))
    event_type    = Column(Enum('Stand', 'Table ronde', 'Atelier', 'Concert', 'Conference', 'Repas'))
    start_time    = Column(DateTime, default=datetime.datetime.now)
    end_time      = Column(DateTime, default=datetime.datetime.now)
    description   = Column(UnicodeText)       
    created       = Column(DateTime, default=datetime.datetime.now)
    last_change   = Column(DateTime, default=datetime.datetime.now)
    intervenants  = relationship(User,
                        secondary='user_event_link',
                        backref=backref('participate', uselist=False),
                        lazy='dynamic')
    interventions = relationship(User_Event, backref="matching_events")
    Salle         = relationship(Salles, backref='allevents')
    
    @classmethod
    def by_id(cls, uid):
        return DBSession.query(cls)\
            .filter(cls.uid == uid).first()


    @classmethod
    def by_slug(cls, slug, year=None):
        if not year is None:
            return DBSession.query(cls)\
                .filter(cls.for_year==year)\
                .filter(cls.slug == slug).first()
        else:
            return DBSession.query(cls)\
                .filter(cls.slug == slug).first()

    @property
    def video(self):
        return DBSession.query(Media) \
            .filter(Media.media_table == 'event') \
            .filter(Media.media_type == 'Video') \
            .filter(Media.link_id == self.uid)

    @property
    def presentation(self):
        return DBSession.query(Media) \
            .filter(Media.media_table == 'event') \
            .filter(Media.media_type == 'Pres') \
            .filter(Media.link_id == self.uid)
            
    @property
    def created_in_words(self):
        return time_ago_in_words(self.created)
        
class Entry(Base):
    __tablename__ = 'entries'
    id = Column(Integer, primary_key=True)
    active      = Column(Integer, default=True)     
    title       = Column(Unicode(255), unique=True, nullable=False)
    body        = Column(UnicodeText, default=u'')
    created     = Column(DateTime, default=datetime.datetime.now)
    edited      = Column(DateTime, default=datetime.datetime.now)
    
    @classmethod
    def all(cls):
        return DBSession.query(Entry).order_by(sa.desc(Entry.created))
    
    @classmethod
    def by_id(cls, id):
        return DBSession.query(Entry).filter(Entry.id == id).first()
    
    @property
    def slug(self):
        return urlify(self.title)
    
    @property
    def created_in_words(self):
        return time_ago_in_words(self.created)
    
    @classmethod
    def get_paginator(cls, request, page=1):
        page_url = PageURL_WebOb(request)
        return Page(Entry.all(), page, url=page_url, items_per_page=5)

#class Seances(Base):
#    __tablename__ = 'seances'
def get_user(request):
    # the below line is just an example, use your own method of
    # accessing a database connection here (this could even be another
    # request property such as request.db, implemented using this same
    # pattern).
    userid = unauthenticated_userid(request)
    if userid is not None:
        # this should return None if the user doesn't exist
        # in the database
        return DBSession.query(User).filter(User.uid==userid).first()


def get_sponsors(request, Year):
    if Year:
        return DBSession.query(Tiers)\
        .join(Role_Tiers, Role_Tiers.tiers_uid == Tiers.uid )\
        .filter( Role_Tiers.tiers_role == 'Sponsor')\
        .filter( Role_Tiers.year_uid == Year)
    else:
        return DBSession.query(Tiers)\
        .join(Role_Tiers, Role_Tiers.tiers_uid == Tiers.uid )\
        .filter( Role_Tiers.tiers_role == 'Sponsor')

def get_exposants(request, Year):
    if Year:
        return DBSession.query(Tiers)\
        .join(Role_Tiers, Role_Tiers.tiers_uid == Tiers.uid )\
        .filter( Role_Tiers.tiers_role == 'Exposant')\
        .filter( Role_Tiers.year_uid == Year)
    else:
        return DBSession.query(Tiers)\
        .join(Role_Tiers, Role_Tiers.tiers_uid == Tiers.uid )\
        .filter( Role_Tiers.tiers_role == 'Exposant')